Change the array of char to an array of struct pollfd to avoid an
[dragonfly.git] / sys / net / if.c
CommitLineData
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1/*
2 * Copyright (c) 1980, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)if.c 8.3 (Berkeley) 1/4/94
1fdf0954 34 * $FreeBSD: src/sys/net/if.c,v 1.185 2004/03/13 02:35:03 brooks Exp $
f2bd8b67 35 * $DragonFly: src/sys/net/if.c,v 1.20 2004/09/10 14:02:00 joerg Exp $
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36 */
37
38#include "opt_compat.h"
39#include "opt_inet6.h"
40#include "opt_inet.h"
41
42#include <sys/param.h>
43#include <sys/malloc.h>
44#include <sys/mbuf.h>
45#include <sys/systm.h>
46#include <sys/proc.h>
6b6e0885 47#include <sys/protosw.h>
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48#include <sys/socket.h>
49#include <sys/socketvar.h>
6b6e0885 50#include <sys/socketops.h>
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51#include <sys/protosw.h>
52#include <sys/kernel.h>
53#include <sys/sockio.h>
54#include <sys/syslog.h>
55#include <sys/sysctl.h>
56
57#include <net/if.h>
58#include <net/if_arp.h>
59#include <net/if_dl.h>
60#include <net/if_types.h>
61#include <net/if_var.h>
62#include <net/radix.h>
63#include <net/route.h>
64#include <machine/stdarg.h>
65
66#if defined(INET) || defined(INET6)
67/*XXX*/
68#include <netinet/in.h>
69#include <netinet/in_var.h>
70#include <netinet/if_ether.h>
71#ifdef INET6
72#include <machine/clock.h> /* XXX: temporal workaround for fxp issue */
73#include <netinet6/in6_var.h>
74#include <netinet6/in6_ifattach.h>
75#endif
76#endif
77
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78#if defined(COMPAT_43)
79#include <emulation/43bsd/43bsd_socket.h>
80#endif /* COMPAT_43 */
81
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82/*
83 * System initialization
84 */
85
61b8d551 86static int ifconf (u_long, caddr_t, struct thread *);
158abb01
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87static void ifinit (void *);
88static void if_qflush (struct ifqueue *);
89static void if_slowtimo (void *);
90static void link_rtrequest (int, struct rtentry *, struct rt_addrinfo *);
91static int if_rtdel (struct radix_node *, void *);
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92
93SYSINIT(interfaces, SI_SUB_PROTO_IF, SI_ORDER_FIRST, ifinit, NULL)
94
95MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address");
96MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address");
b7b982e2 97MALLOC_DEFINE(M_CLONE, "clone", "interface cloning framework");
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98
99int ifqmaxlen = IFQ_MAXLEN;
100struct ifnethead ifnet; /* depend on static init XXX */
101
102#ifdef INET6
103/*
104 * XXX: declare here to avoid to include many inet6 related files..
105 * should be more generalized?
106 */
158abb01 107extern void nd6_setmtu (struct ifnet *);
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108#endif
109
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110struct if_clone *if_clone_lookup (const char *, int *);
111int if_clone_list (struct if_clonereq *);
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112
113LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners);
114int if_cloners_count;
115
116/*
117 * Network interface utility routines.
118 *
119 * Routines with ifa_ifwith* names take sockaddr *'s as
120 * parameters.
121 */
122/* ARGSUSED*/
123void
124ifinit(dummy)
125 void *dummy;
126{
127 struct ifnet *ifp;
128 int s;
129
130 s = splimp();
131 TAILQ_FOREACH(ifp, &ifnet, if_link) {
132 if (ifp->if_snd.ifq_maxlen == 0) {
3e4a09e7 133 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n");
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134 ifp->if_snd.ifq_maxlen = ifqmaxlen;
135 }
136 }
137 splx(s);
138 if_slowtimo(0);
139}
140
141int if_index = 0;
142struct ifaddr **ifnet_addrs;
143struct ifnet **ifindex2ifnet = NULL;
144
145
146/*
147 * Attach an interface to the
148 * list of "active" interfaces.
149 */
150void
151if_attach(ifp)
152 struct ifnet *ifp;
153{
154 unsigned socksize, ifasize;
155 int namelen, masklen;
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156 struct sockaddr_dl *sdl;
157 struct ifaddr *ifa;
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158 static int if_indexlim = 8;
159 static int inited;
160
161 if (!inited) {
162 TAILQ_INIT(&ifnet);
163 inited = 1;
164 }
165
166 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link);
167 ifp->if_index = ++if_index;
168 /*
169 * XXX -
170 * The old code would work if the interface passed a pre-existing
171 * chain of ifaddrs to this code. We don't trust our callers to
172 * properly initialize the tailq, however, so we no longer allow
173 * this unlikely case.
174 */
175 TAILQ_INIT(&ifp->if_addrhead);
176 TAILQ_INIT(&ifp->if_prefixhead);
177 LIST_INIT(&ifp->if_multiaddrs);
178 getmicrotime(&ifp->if_lastchange);
179 if (ifnet_addrs == 0 || if_index >= if_indexlim) {
180 unsigned n = (if_indexlim <<= 1) * sizeof(ifa);
181 caddr_t q = malloc(n, M_IFADDR, M_WAITOK);
182 bzero(q, n);
183 if (ifnet_addrs) {
184 bcopy((caddr_t)ifnet_addrs, (caddr_t)q, n/2);
185 free((caddr_t)ifnet_addrs, M_IFADDR);
186 }
187 ifnet_addrs = (struct ifaddr **)q;
188
189 /* grow ifindex2ifnet */
190 n = if_indexlim * sizeof(struct ifnet *);
191 q = malloc(n, M_IFADDR, M_WAITOK);
192 bzero(q, n);
193 if (ifindex2ifnet) {
194 bcopy((caddr_t)ifindex2ifnet, q, n/2);
195 free((caddr_t)ifindex2ifnet, M_IFADDR);
196 }
197 ifindex2ifnet = (struct ifnet **)q;
198 }
199
200 ifindex2ifnet[if_index] = ifp;
201
202 /*
203 * create a Link Level name for this device
204 */
3e4a09e7 205 namelen = strlen(ifp->if_xname);
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206#define _offsetof(t, m) ((int)((caddr_t)&((t *)0)->m))
207 masklen = _offsetof(struct sockaddr_dl, sdl_data[0]) + namelen;
208 socksize = masklen + ifp->if_addrlen;
209#define ROUNDUP(a) (1 + (((a) - 1) | (sizeof(long) - 1)))
210 if (socksize < sizeof(*sdl))
211 socksize = sizeof(*sdl);
212 socksize = ROUNDUP(socksize);
213 ifasize = sizeof(*ifa) + 2 * socksize;
214 ifa = (struct ifaddr *)malloc(ifasize, M_IFADDR, M_WAITOK);
215 if (ifa) {
216 bzero((caddr_t)ifa, ifasize);
217 sdl = (struct sockaddr_dl *)(ifa + 1);
218 sdl->sdl_len = socksize;
219 sdl->sdl_family = AF_LINK;
3e4a09e7 220 bcopy(ifp->if_xname, sdl->sdl_data, namelen);
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221 sdl->sdl_nlen = namelen;
222 sdl->sdl_index = ifp->if_index;
223 sdl->sdl_type = ifp->if_type;
224 ifnet_addrs[if_index - 1] = ifa;
225 ifa->ifa_ifp = ifp;
226 ifa->ifa_rtrequest = link_rtrequest;
227 ifa->ifa_addr = (struct sockaddr *)sdl;
228 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl);
229 ifa->ifa_netmask = (struct sockaddr *)sdl;
230 sdl->sdl_len = masklen;
231 while (namelen != 0)
232 sdl->sdl_data[--namelen] = 0xff;
233 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link);
234 }
235
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236 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp);
237
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238 /* Announce the interface. */
239 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
240}
241
242/*
243 * Detach an interface, removing it from the
244 * list of "active" interfaces.
245 */
246void
247if_detach(ifp)
248 struct ifnet *ifp;
249{
250 struct ifaddr *ifa;
251 struct radix_node_head *rnh;
252 int s;
253 int i;
254
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255 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp);
256
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257 /*
258 * Remove routes and flush queues.
259 */
260 s = splnet();
261 if_down(ifp);
262
263 /*
264 * Remove address from ifnet_addrs[] and maybe decrement if_index.
265 * Clean up all addresses.
266 */
267 ifnet_addrs[ifp->if_index - 1] = 0;
268 while (if_index > 0 && ifnet_addrs[if_index - 1] == 0)
269 if_index--;
270
271 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa;
272 ifa = TAILQ_FIRST(&ifp->if_addrhead)) {
273#ifdef INET
274 /* XXX: Ugly!! ad hoc just for INET */
275 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) {
276 struct ifaliasreq ifr;
277
278 bzero(&ifr, sizeof(ifr));
279 ifr.ifra_addr = *ifa->ifa_addr;
280 if (ifa->ifa_dstaddr)
281 ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
282 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp,
283 NULL) == 0)
284 continue;
285 }
286#endif /* INET */
287#ifdef INET6
288 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) {
289 in6_purgeaddr(ifa);
290 /* ifp_addrhead is already updated */
291 continue;
292 }
293#endif /* INET6 */
294 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
295 IFAFREE(ifa);
296 }
297
298#ifdef INET6
299 /*
300 * Remove all IPv6 kernel structs related to ifp. This should be done
301 * before removing routing entries below, since IPv6 interface direct
302 * routes are expected to be removed by the IPv6-specific kernel API.
303 * Otherwise, the kernel will detect some inconsistency and bark it.
304 */
305 in6_ifdetach(ifp);
306#endif
307
308 /*
309 * Delete all remaining routes using this interface
310 * Unfortuneatly the only way to do this is to slog through
311 * the entire routing table looking for routes which point
312 * to this interface...oh well...
313 */
314 for (i = 1; i <= AF_MAX; i++) {
315 if ((rnh = rt_tables[i]) == NULL)
316 continue;
317 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp);
318 }
319
320 /* Announce that the interface is gone. */
321 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
322
323 TAILQ_REMOVE(&ifnet, ifp, if_link);
324 splx(s);
325}
326
327/*
328 * Delete Routes for a Network Interface
329 *
330 * Called for each routing entry via the rnh->rnh_walktree() call above
331 * to delete all route entries referencing a detaching network interface.
332 *
333 * Arguments:
334 * rn pointer to node in the routing table
335 * arg argument passed to rnh->rnh_walktree() - detaching interface
336 *
337 * Returns:
338 * 0 successful
339 * errno failed - reason indicated
340 *
341 */
342static int
343if_rtdel(rn, arg)
344 struct radix_node *rn;
345 void *arg;
346{
347 struct rtentry *rt = (struct rtentry *)rn;
348 struct ifnet *ifp = arg;
349 int err;
350
351 if (rt->rt_ifp == ifp) {
352
353 /*
354 * Protect (sorta) against walktree recursion problems
355 * with cloned routes
356 */
357 if ((rt->rt_flags & RTF_UP) == 0)
358 return (0);
359
360 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
361 rt_mask(rt), rt->rt_flags,
362 (struct rtentry **) NULL);
363 if (err) {
364 log(LOG_WARNING, "if_rtdel: error %d\n", err);
365 }
366 }
367
368 return (0);
369}
370
371/*
372 * Create a clone network interface.
373 */
374int
375if_clone_create(name, len)
376 char *name;
377 int len;
378{
379 struct if_clone *ifc;
380 char *dp;
b7b982e2 381 int wildcard, bytoff, bitoff;
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382 int unit;
383 int err;
384
385 ifc = if_clone_lookup(name, &unit);
386 if (ifc == NULL)
387 return (EINVAL);
388
389 if (ifunit(name) != NULL)
390 return (EEXIST);
391
b7b982e2 392 bytoff = bitoff = 0;
984263bc 393 wildcard = (unit < 0);
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394 /*
395 * Find a free unit if none was given.
396 */
397 if (wildcard) {
398 while ((bytoff < ifc->ifc_bmlen)
399 && (ifc->ifc_units[bytoff] == 0xff))
400 bytoff++;
401 if (bytoff >= ifc->ifc_bmlen)
402 return (ENOSPC);
403 while ((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0)
404 bitoff++;
405 unit = (bytoff << 3) + bitoff;
406 }
984263bc 407
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408 if (unit > ifc->ifc_maxunit)
409 return (ENXIO);
410
411 err = (*ifc->ifc_create)(ifc, unit);
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412 if (err != 0)
413 return (err);
414
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415 if (!wildcard) {
416 bytoff = unit >> 3;
417 bitoff = unit - (bytoff << 3);
418 }
419
420 /*
421 * Allocate the unit in the bitmap.
422 */
423 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) == 0,
424 ("%s: bit is already set", __func__));
425 ifc->ifc_units[bytoff] |= (1 << bitoff);
426
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427 /* In the wildcard case, we need to update the name. */
428 if (wildcard) {
429 for (dp = name; *dp != '\0'; dp++);
430 if (snprintf(dp, len - (dp-name), "%d", unit) >
431 len - (dp-name) - 1) {
432 /*
433 * This can only be a programmer error and
434 * there's no straightforward way to recover if
435 * it happens.
436 */
437 panic("if_clone_create(): interface name too long");
438 }
b7b982e2 439
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440 }
441
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442 EVENTHANDLER_INVOKE(if_clone_event, ifc);
443
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444 return (0);
445}
446
447/*
448 * Destroy a clone network interface.
449 */
450int
451if_clone_destroy(name)
452 const char *name;
453{
454 struct if_clone *ifc;
455 struct ifnet *ifp;
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456 int bytoff, bitoff;
457 int unit;
984263bc 458
b7b982e2 459 ifc = if_clone_lookup(name, &unit);
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460 if (ifc == NULL)
461 return (EINVAL);
462
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463 if (unit < ifc->ifc_minifs)
464 return (EINVAL);
465
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466 ifp = ifunit(name);
467 if (ifp == NULL)
468 return (ENXIO);
469
470 if (ifc->ifc_destroy == NULL)
471 return (EOPNOTSUPP);
472
473 (*ifc->ifc_destroy)(ifp);
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474
475 /*
476 * Compute offset in the bitmap and deallocate the unit.
477 */
478 bytoff = unit >> 3;
479 bitoff = unit - (bytoff << 3);
480 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0,
481 ("%s: bit is already cleared", __func__));
482 ifc->ifc_units[bytoff] &= ~(1 << bitoff);
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483 return (0);
484}
485
486/*
487 * Look up a network interface cloner.
488 */
489struct if_clone *
490if_clone_lookup(name, unitp)
491 const char *name;
492 int *unitp;
493{
494 struct if_clone *ifc;
495 const char *cp;
496 int i;
497
498 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL;) {
499 for (cp = name, i = 0; i < ifc->ifc_namelen; i++, cp++) {
500 if (ifc->ifc_name[i] != *cp)
501 goto next_ifc;
502 }
503 goto found_name;
504 next_ifc:
505 ifc = LIST_NEXT(ifc, ifc_list);
506 }
507
508 /* No match. */
509 return ((struct if_clone *)NULL);
510
511 found_name:
512 if (*cp == '\0') {
513 i = -1;
514 } else {
515 for (i = 0; *cp != '\0'; cp++) {
516 if (*cp < '0' || *cp > '9') {
517 /* Bogus unit number. */
518 return (NULL);
519 }
520 i = (i * 10) + (*cp - '0');
521 }
522 }
523
524 if (unitp != NULL)
525 *unitp = i;
526 return (ifc);
527}
528
529/*
530 * Register a network interface cloner.
531 */
532void
533if_clone_attach(ifc)
534 struct if_clone *ifc;
535{
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536 int bytoff, bitoff;
537 int err;
538 int len, maxclone;
539 int unit;
540
541 KASSERT(ifc->ifc_minifs - 1 <= ifc->ifc_maxunit,
542 ("%s: %s requested more units then allowed (%d > %d)",
543 __func__, ifc->ifc_name, ifc->ifc_minifs,
544 ifc->ifc_maxunit + 1));
545 /*
546 * Compute bitmap size and allocate it.
547 */
548 maxclone = ifc->ifc_maxunit + 1;
549 len = maxclone >> 3;
550 if ((len << 3) < maxclone)
551 len++;
552 ifc->ifc_units = malloc(len, M_CLONE, M_WAITOK | M_ZERO);
553 ifc->ifc_bmlen = len;
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554
555 LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list);
556 if_cloners_count++;
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557
558 for (unit = 0; unit < ifc->ifc_minifs; unit++) {
559 err = (*ifc->ifc_create)(ifc, unit);
560 KASSERT(err == 0,
561 ("%s: failed to create required interface %s%d",
562 __func__, ifc->ifc_name, unit));
563
564 /* Allocate the unit in the bitmap. */
565 bytoff = unit >> 3;
566 bitoff = unit - (bytoff << 3);
567 ifc->ifc_units[bytoff] |= (1 << bitoff);
568 }
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569}
570
571/*
572 * Unregister a network interface cloner.
573 */
574void
575if_clone_detach(ifc)
576 struct if_clone *ifc;
577{
578
579 LIST_REMOVE(ifc, ifc_list);
b7b982e2 580 free(ifc->ifc_units, M_CLONE);
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581 if_cloners_count--;
582}
583
584/*
585 * Provide list of interface cloners to userspace.
586 */
587int
588if_clone_list(ifcr)
589 struct if_clonereq *ifcr;
590{
591 char outbuf[IFNAMSIZ], *dst;
592 struct if_clone *ifc;
593 int count, error = 0;
594
595 ifcr->ifcr_total = if_cloners_count;
596 if ((dst = ifcr->ifcr_buffer) == NULL) {
597 /* Just asking how many there are. */
598 return (0);
599 }
600
601 if (ifcr->ifcr_count < 0)
602 return (EINVAL);
603
604 count = (if_cloners_count < ifcr->ifcr_count) ?
605 if_cloners_count : ifcr->ifcr_count;
606
607 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0;
608 ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) {
3e4a09e7 609 strlcpy(outbuf, ifc->ifc_name, IFNAMSIZ);
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610 error = copyout(outbuf, dst, IFNAMSIZ);
611 if (error)
612 break;
613 }
614
615 return (error);
616}
617
618/*
619 * Locate an interface based on a complete address.
620 */
621/*ARGSUSED*/
622struct ifaddr *
623ifa_ifwithaddr(addr)
82ed7fc2 624 struct sockaddr *addr;
984263bc 625{
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626 struct ifnet *ifp;
627 struct ifaddr *ifa;
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628
629#define equal(a1, a2) \
630 (bcmp((caddr_t)(a1), (caddr_t)(a2), ((struct sockaddr *)(a1))->sa_len) == 0)
631 TAILQ_FOREACH(ifp, &ifnet, if_link)
632 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
633 if (ifa->ifa_addr->sa_family != addr->sa_family)
634 continue;
635 if (equal(addr, ifa->ifa_addr))
636 return (ifa);
637 if ((ifp->if_flags & IFF_BROADCAST) && ifa->ifa_broadaddr &&
638 /* IP6 doesn't have broadcast */
639 ifa->ifa_broadaddr->sa_len != 0 &&
640 equal(ifa->ifa_broadaddr, addr))
641 return (ifa);
642 }
643 return ((struct ifaddr *)0);
644}
645/*
646 * Locate the point to point interface with a given destination address.
647 */
648/*ARGSUSED*/
649struct ifaddr *
650ifa_ifwithdstaddr(addr)
82ed7fc2 651 struct sockaddr *addr;
984263bc 652{
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653 struct ifnet *ifp;
654 struct ifaddr *ifa;
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655
656 TAILQ_FOREACH(ifp, &ifnet, if_link)
657 if (ifp->if_flags & IFF_POINTOPOINT)
658 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
659 if (ifa->ifa_addr->sa_family != addr->sa_family)
660 continue;
661 if (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))
662 return (ifa);
663 }
664 return ((struct ifaddr *)0);
665}
666
667/*
668 * Find an interface on a specific network. If many, choice
669 * is most specific found.
670 */
671struct ifaddr *
672ifa_ifwithnet(addr)
673 struct sockaddr *addr;
674{
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675 struct ifnet *ifp;
676 struct ifaddr *ifa;
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677 struct ifaddr *ifa_maybe = (struct ifaddr *) 0;
678 u_int af = addr->sa_family;
679 char *addr_data = addr->sa_data, *cplim;
680
681 /*
682 * AF_LINK addresses can be looked up directly by their index number,
683 * so do that if we can.
684 */
685 if (af == AF_LINK) {
82ed7fc2 686 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr;
984263bc
MD
687 if (sdl->sdl_index && sdl->sdl_index <= if_index)
688 return (ifnet_addrs[sdl->sdl_index - 1]);
689 }
690
691 /*
692 * Scan though each interface, looking for ones that have
693 * addresses in this address family.
694 */
695 TAILQ_FOREACH(ifp, &ifnet, if_link) {
696 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
82ed7fc2 697 char *cp, *cp2, *cp3;
984263bc
MD
698
699 if (ifa->ifa_addr->sa_family != af)
700next: continue;
701 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) {
702 /*
703 * This is a bit broken as it doesn't
704 * take into account that the remote end may
705 * be a single node in the network we are
706 * looking for.
707 * The trouble is that we don't know the
708 * netmask for the remote end.
709 */
710 if (ifa->ifa_dstaddr != 0
711 && equal(addr, ifa->ifa_dstaddr))
712 return (ifa);
713 } else {
714 /*
715 * if we have a special address handler,
716 * then use it instead of the generic one.
717 */
718 if (ifa->ifa_claim_addr) {
719 if ((*ifa->ifa_claim_addr)(ifa, addr)) {
720 return (ifa);
721 } else {
722 continue;
723 }
724 }
725
726 /*
727 * Scan all the bits in the ifa's address.
728 * If a bit dissagrees with what we are
729 * looking for, mask it with the netmask
730 * to see if it really matters.
731 * (A byte at a time)
732 */
733 if (ifa->ifa_netmask == 0)
734 continue;
735 cp = addr_data;
736 cp2 = ifa->ifa_addr->sa_data;
737 cp3 = ifa->ifa_netmask->sa_data;
738 cplim = ifa->ifa_netmask->sa_len
739 + (char *)ifa->ifa_netmask;
740 while (cp3 < cplim)
741 if ((*cp++ ^ *cp2++) & *cp3++)
742 goto next; /* next address! */
743 /*
744 * If the netmask of what we just found
745 * is more specific than what we had before
746 * (if we had one) then remember the new one
747 * before continuing to search
748 * for an even better one.
749 */
750 if (ifa_maybe == 0 ||
751 rn_refines((caddr_t)ifa->ifa_netmask,
752 (caddr_t)ifa_maybe->ifa_netmask))
753 ifa_maybe = ifa;
754 }
755 }
756 }
757 return (ifa_maybe);
758}
759
760/*
761 * Find an interface address specific to an interface best matching
762 * a given address.
763 */
764struct ifaddr *
765ifaof_ifpforaddr(addr, ifp)
766 struct sockaddr *addr;
82ed7fc2 767 struct ifnet *ifp;
984263bc 768{
82ed7fc2
RG
769 struct ifaddr *ifa;
770 char *cp, *cp2, *cp3;
771 char *cplim;
984263bc
MD
772 struct ifaddr *ifa_maybe = 0;
773 u_int af = addr->sa_family;
774
775 if (af >= AF_MAX)
776 return (0);
777 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
778 if (ifa->ifa_addr->sa_family != af)
779 continue;
780 if (ifa_maybe == 0)
781 ifa_maybe = ifa;
782 if (ifa->ifa_netmask == 0) {
783 if (equal(addr, ifa->ifa_addr) ||
784 (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)))
785 return (ifa);
786 continue;
787 }
788 if (ifp->if_flags & IFF_POINTOPOINT) {
789 if (equal(addr, ifa->ifa_dstaddr))
790 return (ifa);
791 } else {
792 cp = addr->sa_data;
793 cp2 = ifa->ifa_addr->sa_data;
794 cp3 = ifa->ifa_netmask->sa_data;
795 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
796 for (; cp3 < cplim; cp3++)
797 if ((*cp++ ^ *cp2++) & *cp3)
798 break;
799 if (cp3 == cplim)
800 return (ifa);
801 }
802 }
803 return (ifa_maybe);
804}
805
806#include <net/route.h>
807
808/*
809 * Default action when installing a route with a Link Level gateway.
810 * Lookup an appropriate real ifa to point to.
811 * This should be moved to /sys/net/link.c eventually.
812 */
813static void
814link_rtrequest(cmd, rt, info)
815 int cmd;
82ed7fc2 816 struct rtentry *rt;
984263bc
MD
817 struct rt_addrinfo *info;
818{
82ed7fc2 819 struct ifaddr *ifa;
984263bc
MD
820 struct sockaddr *dst;
821 struct ifnet *ifp;
822
823 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) ||
824 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0))
825 return;
826 ifa = ifaof_ifpforaddr(dst, ifp);
827 if (ifa) {
828 IFAFREE(rt->rt_ifa);
829 rt->rt_ifa = ifa;
830 ifa->ifa_refcnt++;
831 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)
832 ifa->ifa_rtrequest(cmd, rt, info);
833 }
834}
835
836/*
837 * Mark an interface down and notify protocols of
838 * the transition.
839 * NOTE: must be called at splnet or eqivalent.
840 */
841void
842if_unroute(ifp, flag, fam)
82ed7fc2 843 struct ifnet *ifp;
984263bc
MD
844 int flag, fam;
845{
82ed7fc2 846 struct ifaddr *ifa;
984263bc
MD
847
848 ifp->if_flags &= ~flag;
849 getmicrotime(&ifp->if_lastchange);
850 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
851 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
852 pfctlinput(PRC_IFDOWN, ifa->ifa_addr);
853 if_qflush(&ifp->if_snd);
854 rt_ifmsg(ifp);
855}
856
857/*
858 * Mark an interface up and notify protocols of
859 * the transition.
860 * NOTE: must be called at splnet or eqivalent.
861 */
862void
863if_route(ifp, flag, fam)
82ed7fc2 864 struct ifnet *ifp;
984263bc
MD
865 int flag, fam;
866{
82ed7fc2 867 struct ifaddr *ifa;
984263bc
MD
868
869 ifp->if_flags |= flag;
870 getmicrotime(&ifp->if_lastchange);
871 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
872 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
873 pfctlinput(PRC_IFUP, ifa->ifa_addr);
874 rt_ifmsg(ifp);
875#ifdef INET6
876 in6_if_up(ifp);
877#endif
878}
879
880/*
881 * Mark an interface down and notify protocols of
882 * the transition.
883 * NOTE: must be called at splnet or eqivalent.
884 */
885void
886if_down(ifp)
82ed7fc2 887 struct ifnet *ifp;
984263bc
MD
888{
889
890 if_unroute(ifp, IFF_UP, AF_UNSPEC);
891}
892
893/*
894 * Mark an interface up and notify protocols of
895 * the transition.
896 * NOTE: must be called at splnet or eqivalent.
897 */
898void
899if_up(ifp)
82ed7fc2 900 struct ifnet *ifp;
984263bc
MD
901{
902
903 if_route(ifp, IFF_UP, AF_UNSPEC);
904}
905
906/*
907 * Flush an interface queue.
908 */
909static void
910if_qflush(ifq)
82ed7fc2 911 struct ifqueue *ifq;
984263bc 912{
82ed7fc2 913 struct mbuf *m, *n;
984263bc
MD
914
915 n = ifq->ifq_head;
916 while ((m = n) != 0) {
9a275e74 917 n = m->m_nextpkt;
984263bc
MD
918 m_freem(m);
919 }
920 ifq->ifq_head = 0;
921 ifq->ifq_tail = 0;
922 ifq->ifq_len = 0;
923}
924
925/*
926 * Handle interface watchdog timer routines. Called
927 * from softclock, we decrement timers (if set) and
928 * call the appropriate interface routine on expiration.
929 */
930static void
931if_slowtimo(arg)
932 void *arg;
933{
82ed7fc2 934 struct ifnet *ifp;
984263bc
MD
935 int s = splimp();
936
937 TAILQ_FOREACH(ifp, &ifnet, if_link) {
938 if (ifp->if_timer == 0 || --ifp->if_timer)
939 continue;
940 if (ifp->if_watchdog)
941 (*ifp->if_watchdog)(ifp);
942 }
943 splx(s);
944 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ);
945}
946
947/*
948 * Map interface name to
949 * interface structure pointer.
950 */
951struct ifnet *
952ifunit(const char *name)
953{
984263bc 954 struct ifnet *ifp;
984263bc 955
984263bc 956 /*
3e4a09e7 957 * Search all the interfaces for this name/number
984263bc 958 */
3e4a09e7 959
984263bc 960 TAILQ_FOREACH(ifp, &ifnet, if_link) {
3e4a09e7 961 if (strncmp(ifp->if_xname, name, IFNAMSIZ) == 0)
984263bc
MD
962 break;
963 }
964 return (ifp);
965}
966
967
968/*
969 * Map interface name in a sockaddr_dl to
970 * interface structure pointer.
971 */
972struct ifnet *
973if_withname(sa)
974 struct sockaddr *sa;
975{
976 char ifname[IFNAMSIZ+1];
977 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
978
979 if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) ||
980 (sdl->sdl_nlen > IFNAMSIZ) )
981 return NULL;
982
983 /*
984 * ifunit wants a null-terminated name. It may not be null-terminated
985 * in the sockaddr. We don't want to change the caller's sockaddr,
986 * and there might not be room to put the trailing null anyway, so we
987 * make a local copy that we know we can null terminate safely.
988 */
989
990 bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen);
991 ifname[sdl->sdl_nlen] = '\0';
992 return ifunit(ifname);
993}
994
995
996/*
997 * Interface ioctls.
998 */
999int
dadab5e9 1000ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td)
984263bc 1001{
41c20dac
MD
1002 struct ifnet *ifp;
1003 struct ifreq *ifr;
984263bc
MD
1004 struct ifstat *ifs;
1005 int error;
1006 short oif_flags;
1007 int new_flags;
1fdf0954
HP
1008 size_t namelen, onamelen;
1009 char new_name[IFNAMSIZ];
1010 struct ifaddr *ifa;
1011 struct sockaddr_dl *sdl;
984263bc
MD
1012
1013 switch (cmd) {
1014
1015 case SIOCGIFCONF:
1016 case OSIOCGIFCONF:
61b8d551 1017 return (ifconf(cmd, data, td));
984263bc
MD
1018 }
1019 ifr = (struct ifreq *)data;
1020
1021 switch (cmd) {
1022 case SIOCIFCREATE:
1023 case SIOCIFDESTROY:
dadab5e9 1024 if ((error = suser(td)) != 0)
984263bc
MD
1025 return (error);
1026 return ((cmd == SIOCIFCREATE) ?
1027 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) :
1028 if_clone_destroy(ifr->ifr_name));
1029
1030 case SIOCIFGCLONERS:
1031 return (if_clone_list((struct if_clonereq *)data));
1032 }
1033
1034 ifp = ifunit(ifr->ifr_name);
1035 if (ifp == 0)
1036 return (ENXIO);
1037 switch (cmd) {
1038
1039 case SIOCGIFFLAGS:
1040 ifr->ifr_flags = ifp->if_flags;
46f25451 1041 ifr->ifr_flagshigh = ifp->if_flags >> 16;
984263bc
MD
1042 break;
1043
1044 case SIOCGIFCAP:
1045 ifr->ifr_reqcap = ifp->if_capabilities;
1046 ifr->ifr_curcap = ifp->if_capenable;
1047 break;
1048
1049 case SIOCGIFMETRIC:
1050 ifr->ifr_metric = ifp->if_metric;
1051 break;
1052
1053 case SIOCGIFMTU:
1054 ifr->ifr_mtu = ifp->if_mtu;
1055 break;
1056
1057 case SIOCGIFPHYS:
1058 ifr->ifr_phys = ifp->if_physical;
1059 break;
1060
1061 case SIOCSIFFLAGS:
dadab5e9 1062 error = suser(td);
984263bc
MD
1063 if (error)
1064 return (error);
1065 new_flags = (ifr->ifr_flags & 0xffff) |
1066 (ifr->ifr_flagshigh << 16);
1067 if (ifp->if_flags & IFF_SMART) {
1068 /* Smart drivers twiddle their own routes */
1069 } else if (ifp->if_flags & IFF_UP &&
1070 (new_flags & IFF_UP) == 0) {
1071 int s = splimp();
1072 if_down(ifp);
1073 splx(s);
1074 } else if (new_flags & IFF_UP &&
1075 (ifp->if_flags & IFF_UP) == 0) {
1076 int s = splimp();
1077 if_up(ifp);
1078 splx(s);
1079 }
1080 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
1081 (new_flags &~ IFF_CANTCHANGE);
984263bc
MD
1082 if (new_flags & IFF_PPROMISC) {
1083 /* Permanently promiscuous mode requested */
1084 ifp->if_flags |= IFF_PROMISC;
1085 } else if (ifp->if_pcount == 0) {
1086 ifp->if_flags &= ~IFF_PROMISC;
1087 }
1088 if (ifp->if_ioctl)
bd4539cc
JH
1089 (void) (*ifp->if_ioctl)(ifp, cmd, data,
1090 td->td_proc->p_ucred);
984263bc
MD
1091 getmicrotime(&ifp->if_lastchange);
1092 break;
1093
1094 case SIOCSIFCAP:
dadab5e9 1095 error = suser(td);
984263bc
MD
1096 if (error)
1097 return (error);
1098 if (ifr->ifr_reqcap & ~ifp->if_capabilities)
1099 return (EINVAL);
bd4539cc 1100 (void) (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
984263bc
MD
1101 break;
1102
1fdf0954
HP
1103 case SIOCSIFNAME:
1104 error = suser(td);
1105 if (error != 0)
1106 return (error);
1107 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL);
1108 if (error != 0)
1109 return (error);
1110 if (new_name[0] == '\0')
1111 return (EINVAL);
1112 if (ifunit(new_name) != NULL)
1113 return (EEXIST);
f2bd8b67
JS
1114
1115 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp);
1fdf0954
HP
1116
1117 /* Announce the departure of the interface. */
1118 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
1119
1120 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname));
1121 ifa = TAILQ_FIRST(&ifp->if_addrhead);
1122 /* XXX IFA_LOCK(ifa); */
1123 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1124 namelen = strlen(new_name);
1125 onamelen = sdl->sdl_nlen;
1126 /*
1127 * Move the address if needed. This is safe because we
1128 * allocate space for a name of length IFNAMSIZ when we
1129 * create this in if_attach().
1130 */
1131 if (namelen != onamelen) {
1132 bcopy(sdl->sdl_data + onamelen,
1133 sdl->sdl_data + namelen, sdl->sdl_alen);
1134 }
1135 bcopy(new_name, sdl->sdl_data, namelen);
1136 sdl->sdl_nlen = namelen;
1137 sdl = (struct sockaddr_dl *)ifa->ifa_netmask;
1138 bzero(sdl->sdl_data, onamelen);
1139 while (namelen != 0)
1140 sdl->sdl_data[--namelen] = 0xff;
1141 /* XXX IFA_UNLOCK(ifa) */
f2bd8b67
JS
1142
1143 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp);
1fdf0954
HP
1144
1145 /* Announce the return of the interface. */
1146 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
1147 break;
1148
984263bc 1149 case SIOCSIFMETRIC:
dadab5e9 1150 error = suser(td);
984263bc
MD
1151 if (error)
1152 return (error);
1153 ifp->if_metric = ifr->ifr_metric;
1154 getmicrotime(&ifp->if_lastchange);
1155 break;
1156
1157 case SIOCSIFPHYS:
dadab5e9 1158 error = suser(td);
984263bc
MD
1159 if (error)
1160 return error;
1161 if (!ifp->if_ioctl)
1162 return EOPNOTSUPP;
bd4539cc 1163 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
984263bc
MD
1164 if (error == 0)
1165 getmicrotime(&ifp->if_lastchange);
1166 return(error);
1167
1168 case SIOCSIFMTU:
1169 {
1170 u_long oldmtu = ifp->if_mtu;
1171
dadab5e9 1172 error = suser(td);
984263bc
MD
1173 if (error)
1174 return (error);
1175 if (ifp->if_ioctl == NULL)
1176 return (EOPNOTSUPP);
1177 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
1178 return (EINVAL);
bd4539cc 1179 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
984263bc
MD
1180 if (error == 0) {
1181 getmicrotime(&ifp->if_lastchange);
1182 rt_ifmsg(ifp);
1183 }
1184 /*
1185 * If the link MTU changed, do network layer specific procedure.
1186 */
1187 if (ifp->if_mtu != oldmtu) {
1188#ifdef INET6
1189 nd6_setmtu(ifp);
1190#endif
1191 }
1192 return (error);
1193 }
1194
1195 case SIOCADDMULTI:
1196 case SIOCDELMULTI:
dadab5e9 1197 error = suser(td);
984263bc
MD
1198 if (error)
1199 return (error);
1200
1201 /* Don't allow group membership on non-multicast interfaces. */
1202 if ((ifp->if_flags & IFF_MULTICAST) == 0)
1203 return EOPNOTSUPP;
1204
1205 /* Don't let users screw up protocols' entries. */
1206 if (ifr->ifr_addr.sa_family != AF_LINK)
1207 return EINVAL;
1208
1209 if (cmd == SIOCADDMULTI) {
1210 struct ifmultiaddr *ifma;
1211 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
1212 } else {
1213 error = if_delmulti(ifp, &ifr->ifr_addr);
1214 }
1215 if (error == 0)
1216 getmicrotime(&ifp->if_lastchange);
1217 return error;
1218
1219 case SIOCSIFPHYADDR:
1220 case SIOCDIFPHYADDR:
1221#ifdef INET6
1222 case SIOCSIFPHYADDR_IN6:
1223#endif
1224 case SIOCSLIFPHYADDR:
1225 case SIOCSIFMEDIA:
1226 case SIOCSIFGENERIC:
dadab5e9 1227 error = suser(td);
984263bc
MD
1228 if (error)
1229 return (error);
1230 if (ifp->if_ioctl == 0)
1231 return (EOPNOTSUPP);
bd4539cc 1232 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
984263bc
MD
1233 if (error == 0)
1234 getmicrotime(&ifp->if_lastchange);
1235 return error;
1236
1237 case SIOCGIFSTATUS:
1238 ifs = (struct ifstat *)data;
1239 ifs->ascii[0] = '\0';
1240
1241 case SIOCGIFPSRCADDR:
1242 case SIOCGIFPDSTADDR:
1243 case SIOCGLIFPHYADDR:
1244 case SIOCGIFMEDIA:
1245 case SIOCGIFGENERIC:
1246 if (ifp->if_ioctl == 0)
1247 return (EOPNOTSUPP);
bd4539cc 1248 return ((*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred));
984263bc
MD
1249
1250 case SIOCSIFLLADDR:
dadab5e9 1251 error = suser(td);
984263bc
MD
1252 if (error)
1253 return (error);
1254 return if_setlladdr(ifp,
1255 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);
1256
1257 default:
1258 oif_flags = ifp->if_flags;
1259 if (so->so_proto == 0)
1260 return (EOPNOTSUPP);
1261#ifndef COMPAT_43
6b6e0885 1262 error = so_pru_control(so, cmd, data, ifp, td);
984263bc
MD
1263#else
1264 {
1265 int ocmd = cmd;
1266
1267 switch (cmd) {
1268
1269 case SIOCSIFDSTADDR:
1270 case SIOCSIFADDR:
1271 case SIOCSIFBRDADDR:
1272 case SIOCSIFNETMASK:
1273#if BYTE_ORDER != BIG_ENDIAN
1274 if (ifr->ifr_addr.sa_family == 0 &&
1275 ifr->ifr_addr.sa_len < 16) {
1276 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len;
1277 ifr->ifr_addr.sa_len = 16;
1278 }
1279#else
1280 if (ifr->ifr_addr.sa_len == 0)
1281 ifr->ifr_addr.sa_len = 16;
1282#endif
1283 break;
1284
1285 case OSIOCGIFADDR:
1286 cmd = SIOCGIFADDR;
1287 break;
1288
1289 case OSIOCGIFDSTADDR:
1290 cmd = SIOCGIFDSTADDR;
1291 break;
1292
1293 case OSIOCGIFBRDADDR:
1294 cmd = SIOCGIFBRDADDR;
1295 break;
1296
1297 case OSIOCGIFNETMASK:
1298 cmd = SIOCGIFNETMASK;
1299 }
6b6e0885 1300 error = so_pru_control(so, cmd, data, ifp, td);
984263bc
MD
1301 switch (ocmd) {
1302
1303 case OSIOCGIFADDR:
1304 case OSIOCGIFDSTADDR:
1305 case OSIOCGIFBRDADDR:
1306 case OSIOCGIFNETMASK:
1307 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;
1308
1309 }
1310 }
1311#endif /* COMPAT_43 */
1312
1313 if ((oif_flags ^ ifp->if_flags) & IFF_UP) {
1314#ifdef INET6
1315 DELAY(100);/* XXX: temporary workaround for fxp issue*/
1316 if (ifp->if_flags & IFF_UP) {
1317 int s = splimp();
1318 in6_if_up(ifp);
1319 splx(s);
1320 }
1321#endif
1322 }
1323 return (error);
1324
1325 }
1326 return (0);
1327}
1328
1329/*
1330 * Set/clear promiscuous mode on interface ifp based on the truth value
1331 * of pswitch. The calls are reference counted so that only the first
1332 * "on" request actually has an effect, as does the final "off" request.
1333 * Results are undefined if the "off" and "on" requests are not matched.
1334 */
1335int
1336ifpromisc(ifp, pswitch)
1337 struct ifnet *ifp;
1338 int pswitch;
1339{
1340 struct ifreq ifr;
1341 int error;
1342 int oldflags;
1343
1344 oldflags = ifp->if_flags;
46f25451 1345 if (ifp->if_flags & IFF_PPROMISC) {
984263bc
MD
1346 /* Do nothing if device is in permanently promiscuous mode */
1347 ifp->if_pcount += pswitch ? 1 : -1;
1348 return (0);
1349 }
1350 if (pswitch) {
1351 /*
1352 * If the device is not configured up, we cannot put it in
1353 * promiscuous mode.
1354 */
1355 if ((ifp->if_flags & IFF_UP) == 0)
1356 return (ENETDOWN);
1357 if (ifp->if_pcount++ != 0)
1358 return (0);
1359 ifp->if_flags |= IFF_PROMISC;
3e4a09e7
MD
1360 log(LOG_INFO, "%s: promiscuous mode enabled\n",
1361 ifp->if_xname);
984263bc
MD
1362 } else {
1363 if (--ifp->if_pcount > 0)
1364 return (0);
1365 ifp->if_flags &= ~IFF_PROMISC;
3e4a09e7
MD
1366 log(LOG_INFO, "%s: promiscuous mode disabled\n",
1367 ifp->if_xname);
984263bc
MD
1368 }
1369 ifr.ifr_flags = ifp->if_flags;
46f25451 1370 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1371 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1372 (struct ucred *)NULL);
984263bc
MD
1373 if (error == 0)
1374 rt_ifmsg(ifp);
1375 else
1376 ifp->if_flags = oldflags;
1377 return error;
1378}
1379
1380/*
1381 * Return interface configuration
1382 * of system. List may be used
1383 * in later ioctl's (above) to get
1384 * other information.
1385 */
1386/*ARGSUSED*/
1387static int
61b8d551 1388ifconf(u_long cmd, caddr_t data, struct thread *td)
984263bc 1389{
41c20dac
MD
1390 struct ifconf *ifc = (struct ifconf *)data;
1391 struct ifnet *ifp;
1392 struct ifaddr *ifa;
984263bc
MD
1393 struct sockaddr *sa;
1394 struct ifreq ifr, *ifrp;
1395 int space = ifc->ifc_len, error = 0;
1396
1397 ifrp = ifc->ifc_req;
1398 TAILQ_FOREACH(ifp, &ifnet, if_link) {
3e4a09e7 1399 int addrs;
984263bc
MD
1400
1401 if (space <= sizeof (ifr))
1402 break;
3e4a09e7
MD
1403 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name))
1404 >= sizeof(ifr.ifr_name)) {
984263bc
MD
1405 error = ENAMETOOLONG;
1406 break;
984263bc
MD
1407 }
1408
1409 addrs = 0;
984263bc
MD
1410 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1411 if (space <= sizeof(ifr))
1412 break;
1413 sa = ifa->ifa_addr;
61b8d551
JH
1414 if (td->td_proc->p_ucred->cr_prison &&
1415 prison_if(td, sa))
984263bc
MD
1416 continue;
1417 addrs++;
1418#ifdef COMPAT_43
1419 if (cmd == OSIOCGIFCONF) {
1420 struct osockaddr *osa =
1421 (struct osockaddr *)&ifr.ifr_addr;
1422 ifr.ifr_addr = *sa;
1423 osa->sa_family = sa->sa_family;
1424 error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
1425 sizeof (ifr));
1426 ifrp++;
1427 } else
1428#endif
1429 if (sa->sa_len <= sizeof(*sa)) {
1430 ifr.ifr_addr = *sa;
1431 error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
1432 sizeof (ifr));
1433 ifrp++;
1434 } else {
1435 if (space < sizeof (ifr) + sa->sa_len -
1436 sizeof(*sa))
1437 break;
1438 space -= sa->sa_len - sizeof(*sa);
1439 error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
1440 sizeof (ifr.ifr_name));
1441 if (error == 0)
1442 error = copyout((caddr_t)sa,
1443 (caddr_t)&ifrp->ifr_addr, sa->sa_len);
1444 ifrp = (struct ifreq *)
1445 (sa->sa_len + (caddr_t)&ifrp->ifr_addr);
1446 }
1447 if (error)
1448 break;
1449 space -= sizeof (ifr);
1450 }
1451 if (error)
1452 break;
1453 if (!addrs) {
1454 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
1455 error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
1456 sizeof (ifr));
1457 if (error)
1458 break;
1459 space -= sizeof (ifr);
1460 ifrp++;
1461 }
1462 }
1463 ifc->ifc_len -= space;
1464 return (error);
1465}
1466
1467/*
1468 * Just like if_promisc(), but for all-multicast-reception mode.
1469 */
1470int
1471if_allmulti(ifp, onswitch)
1472 struct ifnet *ifp;
1473 int onswitch;
1474{
1475 int error = 0;
1476 int s = splimp();
1477 struct ifreq ifr;
1478
1479 if (onswitch) {
1480 if (ifp->if_amcount++ == 0) {
1481 ifp->if_flags |= IFF_ALLMULTI;
1482 ifr.ifr_flags = ifp->if_flags;
46f25451 1483 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1484 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1485 (struct ucred *)NULL);
984263bc
MD
1486 }
1487 } else {
1488 if (ifp->if_amcount > 1) {
1489 ifp->if_amcount--;
1490 } else {
1491 ifp->if_amcount = 0;
1492 ifp->if_flags &= ~IFF_ALLMULTI;
1493 ifr.ifr_flags = ifp->if_flags;
46f25451 1494 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1495 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1496 (struct ucred *)NULL);
984263bc
MD
1497 }
1498 }
1499 splx(s);
1500
1501 if (error == 0)
1502 rt_ifmsg(ifp);
1503 return error;
1504}
1505
1506/*
1507 * Add a multicast listenership to the interface in question.
1508 * The link layer provides a routine which converts
1509 */
1510int
1511if_addmulti(ifp, sa, retifma)
1512 struct ifnet *ifp; /* interface to manipulate */
1513 struct sockaddr *sa; /* address to add */
1514 struct ifmultiaddr **retifma;
1515{
1516 struct sockaddr *llsa, *dupsa;
1517 int error, s;
1518 struct ifmultiaddr *ifma;
1519
1520 /*
1521 * If the matching multicast address already exists
1522 * then don't add a new one, just add a reference
1523 */
1524 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1525 if (equal(sa, ifma->ifma_addr)) {
1526 ifma->ifma_refcount++;
1527 if (retifma)
1528 *retifma = ifma;
1529 return 0;
1530 }
1531 }
1532
1533 /*
1534 * Give the link layer a chance to accept/reject it, and also
1535 * find out which AF_LINK address this maps to, if it isn't one
1536 * already.
1537 */
1538 if (ifp->if_resolvemulti) {
1539 error = ifp->if_resolvemulti(ifp, &llsa, sa);
1540 if (error) return error;
1541 } else {
1542 llsa = 0;
1543 }
1544
1545 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK);
1546 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK);
1547 bcopy(sa, dupsa, sa->sa_len);
1548
1549 ifma->ifma_addr = dupsa;
1550 ifma->ifma_lladdr = llsa;
1551 ifma->ifma_ifp = ifp;
1552 ifma->ifma_refcount = 1;
1553 ifma->ifma_protospec = 0;
1554 rt_newmaddrmsg(RTM_NEWMADDR, ifma);
1555
1556 /*
1557 * Some network interfaces can scan the address list at
1558 * interrupt time; lock them out.
1559 */
1560 s = splimp();
1561 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
1562 splx(s);
1563 *retifma = ifma;
1564
1565 if (llsa != 0) {
1566 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1567 if (equal(ifma->ifma_addr, llsa))
1568 break;
1569 }
1570 if (ifma) {
1571 ifma->ifma_refcount++;
1572 } else {
1573 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma,
1574 M_IFMADDR, M_WAITOK);
1575 MALLOC(dupsa, struct sockaddr *, llsa->sa_len,
1576 M_IFMADDR, M_WAITOK);
1577 bcopy(llsa, dupsa, llsa->sa_len);
1578 ifma->ifma_addr = dupsa;
1579 ifma->ifma_ifp = ifp;
1580 ifma->ifma_refcount = 1;
1581 s = splimp();
1582 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
1583 splx(s);
1584 }
1585 }
1586 /*
1587 * We are certain we have added something, so call down to the
1588 * interface to let them know about it.
1589 */
1590 s = splimp();
bd4539cc 1591 ifp->if_ioctl(ifp, SIOCADDMULTI, 0, (struct ucred *)NULL);
984263bc
MD
1592 splx(s);
1593
1594 return 0;
1595}
1596
1597/*
1598 * Remove a reference to a multicast address on this interface. Yell
1599 * if the request does not match an existing membership.
1600 */
1601int
1602if_delmulti(ifp, sa)
1603 struct ifnet *ifp;
1604 struct sockaddr *sa;
1605{
1606 struct ifmultiaddr *ifma;
1607 int s;
1608
1609 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
1610 if (equal(sa, ifma->ifma_addr))
1611 break;
1612 if (ifma == 0)
1613 return ENOENT;
1614
1615 if (ifma->ifma_refcount > 1) {
1616 ifma->ifma_refcount--;
1617 return 0;
1618 }
1619
1620 rt_newmaddrmsg(RTM_DELMADDR, ifma);
1621 sa = ifma->ifma_lladdr;
1622 s = splimp();
1623 LIST_REMOVE(ifma, ifma_link);
1624 /*
1625 * Make sure the interface driver is notified
1626 * in the case of a link layer mcast group being left.
1627 */
1628 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0)
bd4539cc 1629 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, (struct ucred *)NULL);
984263bc
MD
1630 splx(s);
1631 free(ifma->ifma_addr, M_IFMADDR);
1632 free(ifma, M_IFMADDR);
1633 if (sa == 0)
1634 return 0;
1635
1636 /*
1637 * Now look for the link-layer address which corresponds to
1638 * this network address. It had been squirreled away in
1639 * ifma->ifma_lladdr for this purpose (so we don't have
1640 * to call ifp->if_resolvemulti() again), and we saved that
1641 * value in sa above. If some nasty deleted the
1642 * link-layer address out from underneath us, we can deal because
1643 * the address we stored was is not the same as the one which was
1644 * in the record for the link-layer address. (So we don't complain
1645 * in that case.)
1646 */
1647 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
1648 if (equal(sa, ifma->ifma_addr))
1649 break;
1650 if (ifma == 0)
1651 return 0;
1652
1653 if (ifma->ifma_refcount > 1) {
1654 ifma->ifma_refcount--;
1655 return 0;
1656 }
1657
1658 s = splimp();
1659 LIST_REMOVE(ifma, ifma_link);
bd4539cc 1660 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, (struct ucred *)NULL);
984263bc
MD
1661 splx(s);
1662 free(ifma->ifma_addr, M_IFMADDR);
1663 free(sa, M_IFMADDR);
1664 free(ifma, M_IFMADDR);
1665
1666 return 0;
1667}
1668
1669/*
1670 * Set the link layer address on an interface.
1671 *
1672 * At this time we only support certain types of interfaces,
1673 * and we don't allow the length of the address to change.
1674 */
1675int
1676if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
1677{
1678 struct sockaddr_dl *sdl;
1679 struct ifaddr *ifa;
1680 struct ifreq ifr;
1681
1682 ifa = ifnet_addrs[ifp->if_index - 1];
1683 if (ifa == NULL)
1684 return (EINVAL);
1685 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1686 if (sdl == NULL)
1687 return (EINVAL);
1688 if (len != sdl->sdl_alen) /* don't allow length to change */
1689 return (EINVAL);
1690 switch (ifp->if_type) {
1691 case IFT_ETHER: /* these types use struct arpcom */
1692 case IFT_FDDI:
1693 case IFT_XETHER:
1694 case IFT_ISO88025:
1695 case IFT_L2VLAN:
1696 bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len);
1697 /* FALLTHROUGH */
1698 case IFT_ARCNET:
1699 bcopy(lladdr, LLADDR(sdl), len);
1700 break;
1701 default:
1702 return (ENODEV);
1703 }
1704 /*
1705 * If the interface is already up, we need
1706 * to re-init it in order to reprogram its
1707 * address filter.
1708 */
1709 if ((ifp->if_flags & IFF_UP) != 0) {
1710 ifp->if_flags &= ~IFF_UP;
1711 ifr.ifr_flags = ifp->if_flags;
46f25451 1712 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1713 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1714 (struct ucred *)NULL);
984263bc
MD
1715 ifp->if_flags |= IFF_UP;
1716 ifr.ifr_flags = ifp->if_flags;
46f25451 1717 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1718 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1719 (struct ucred *)NULL);
984263bc
MD
1720#ifdef INET
1721 /*
1722 * Also send gratuitous ARPs to notify other nodes about
1723 * the address change.
1724 */
1725 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1726 if (ifa->ifa_addr != NULL &&
1727 ifa->ifa_addr->sa_family == AF_INET)
1728 arp_ifinit(ifp, ifa);
1729 }
1730#endif
1731 }
1732 return (0);
1733}
1734
1735struct ifmultiaddr *
1736ifmaof_ifpforaddr(sa, ifp)
1737 struct sockaddr *sa;
1738 struct ifnet *ifp;
1739{
1740 struct ifmultiaddr *ifma;
1741
1742 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
1743 if (equal(ifma->ifma_addr, sa))
1744 break;
1745
1746 return ifma;
1747}
1748
1550dfd9
MD
1749/*
1750 * The name argument must be a pointer to storage which will last as
1751 * long as the interface does. For physical devices, the result of
1752 * device_get_name(dev) is a good choice and for pseudo-devices a
1753 * static string works well.
1754 */
1755void
1756if_initname(struct ifnet *ifp, const char *name, int unit)
1757{
3e4a09e7
MD
1758 ifp->if_dname = name;
1759 ifp->if_dunit = unit;
1550dfd9
MD
1760 if (unit != IF_DUNIT_NONE)
1761 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit);
1762 else
1763 strlcpy(ifp->if_xname, name, IFNAMSIZ);
1764}
1765
984263bc
MD
1766int
1767if_printf(struct ifnet *ifp, const char *fmt, ...)
1768{
e2565a42 1769 __va_list ap;
984263bc
MD
1770 int retval;
1771
3e4a09e7 1772 retval = printf("%s: ", ifp->if_xname);
e2565a42 1773 __va_start(ap, fmt);
984263bc 1774 retval += vprintf(fmt, ap);
e2565a42 1775 __va_end(ap);
984263bc
MD
1776 return (retval);
1777}
1778
1779SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers");
1780SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");